I have encountered a serious problem. People continue to mistaken my balcony window for thin air. On multiple occasions a dry “thud” could be heard, and then a person would be seen standing either side my balcony, rubbing their noses or foreheads and incredulously tapping for the-glass-that-had-not-been-there-a-moment-ago-I-swear. Only one bird so far committed the mistake, and only out of panic. Statistically, where does that put my fellow humans? And how shall I remedy this issue? By not cleaning my window? But I have such a nice vieeeeeew!!!